CPU with Blinking LED may indicate installation problem, grounding or EMC.The other possible reason can be any problem in CPU (Hardware/Firmware) or accessories (e.g Rack , sync.module).Normally buffer of such CPU is blank but the partner H-CPU contains valueable information, share it here.If you check grounding and EMC , power cyle and check the behavior of the CPU.If problem persists for a long time, update firmware of CPU and watch the result.If you still have same problem after installing CPU in another working rack, contact your nearest SIEMENS repair shop for more help.

hi this problem occur in the redundant system and cpu master without problem in state run and do process control but standby cpu stoped and all ledes blinking than if rack have the problem must be cpu master stoped too.

i disconnect all cables attached cpu but do not resoled this problem.

how i do update firmware when led stop cpu in blinking state ?and i can't connect cpu?

this problem occur in the redundant
system and cpu master without problem in state run and do process
control but standby cpu stoped and all ledes blinking than if rack have
the problem must be cpu master stoped too.

i disconnect all cables attached cpu but do not resoled this problem.

how i do update firmware when led stop cpu in blinking state ?and i can't connect cpu?

This always happens like that for H-CPU.I told you to capture the diagnostics buffer of intact CPU and share it.It is possible to find a clue regarding to the problem there.Some clarifications:

UR2-H has 2 different and isolated sections and even a problematic pin in the rack may cause the problem.Just do a visual check.It is worth mentioning that faulty sync. modules may cause a such a behavior. You may find a clue for that in buffer of working CPU.

If you can not communicate with the CPU,find a big enough Flash memory and a PG for updating operating system of CPU.

Please share the buffer and it includes the exact order number and version of working CPU.